(1)The terms of a tenancy and of any other agreement between the landlord and the tenant are of no effect in so far as they purport to—
(a)require the tenant to carry out, or to pay for or contribute towards the cost of, any work which the landlord requires to ensure be carried out for the purposes of complying with the duty imposed by section 14(1),
(b)exclude or limit that duty, or
(c)provide for termination of the tenancy, or impose on the tenant any penalty, disability or obligation, in the event of the tenant enforcing compliance by the landlord of that duty.
(2)This section is subject to any contrary provision made by order under section 18.